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lib.hh
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#ifndef CHICKADEE_LIB_HH
#define CHICKADEE_LIB_HH
#include "types.h"
#include <new> // for placement new
#include <type_traits>
// lib.hh
//
// Functions, constants, and definitions useful in both the kernel
// and applications.
//
// Contents: (1) C library subset, (2) system call numbers, (3) console.
extern "C" {
void* memcpy(void* dst, const void* src, size_t n);
void* memmove(void* dst, const void* src, size_t n);
void* memset(void* s, int c, size_t n);
int memcmp(const void* a, const void* b, size_t n);
void* memchr(const void* s, int c, size_t n);
size_t strlen(const char* s);
size_t strnlen(const char* s, size_t maxlen);
char* strcpy(char* dst, const char* src);
char* strncpy(char* dst, const char* src, size_t maxlen);
size_t strlcpy(char* dst, const char* src, size_t maxlen);
int strcmp(const char* a, const char* b);
int strncmp(const char* a, const char* b, size_t maxlen);
int strcasecmp(const char* a, const char* b);
int strncasecmp(const char* a, const char* b, size_t maxlen);
char* strchr(const char* s, int c);
char* strstr(const char* haystack, const char* needle);
long strtol(const char* s, char** endptr = nullptr, int base = 0);
unsigned long strtoul(const char* s, char** endptr = nullptr, int base = 0);
ssize_t snprintf(char* s, size_t size, const char* format, ...);
ssize_t vsnprintf(char* s, size_t size, const char* format, va_list val);
inline bool isspace(int c);
inline bool isdigit(int c);
inline bool islower(int c);
inline bool isupper(int c);
inline bool isalpha(int c);
inline bool isalnum(int c);
inline int tolower(int c);
inline int toupper(int c);
}
#define RAND_MAX 0x7FFFFFFF
int rand();
void srand(unsigned seed);
// rand(min, max)
// Return a pseudorandom number roughly evenly distributed between
// `min` and `max`, inclusive. Requires `min <= max` and
// `max - min <= RAND_MAX`.
int rand(int min, int max);
// rand_engine
// A `rand`-style pseudorandom number generator lacking global state.
struct rand_engine {
using result_type = unsigned;
unsigned long seed_;
inline rand_engine() { seed(819234718U); }
inline rand_engine(unsigned s) { seed(s); }
inline rand_engine(unsigned long s) { seed(s); }
inline static constexpr unsigned min() { return 0; }
inline static constexpr unsigned max() { return RAND_MAX; }
inline void seed(unsigned s) { seed(((unsigned long) s) << 32 | s); }
inline void seed(unsigned long s) { seed_ = s; }
unsigned operator()();
unsigned operator()(unsigned min, unsigned max);
int operator()(int min, int max);
};
// from_chars
// C++-style functions that parse integers from the start of a string,
// with error detection.
struct from_chars_result {
const char* ptr;
int ec;
};
from_chars_result from_chars(const char* first, const char* last,
long& value, int base = 10);
from_chars_result from_chars(const char* first, const char* last,
unsigned long& value, int base = 10);
// Return the offset of `member` relative to the beginning of a struct type
#ifndef offsetof
#define offsetof(type, member) __builtin_offsetof(type, member)
#endif
// Return the number of elements in an array
#define arraysize(array) (sizeof(array) / sizeof(array[0]))
// Arithmetic
// min(a, b, ...)
// Return the minimum of the arguments.
template <typename T>
inline constexpr T min(T a, T b) {
return a < b ? a : b;
}
template <typename T, typename... Rest>
inline constexpr T min(T a, T b, Rest... c) {
return min(min(a, b), c...);
}
// max(a, b, ...)
// Return the maximum of the arguments.
template <typename T>
inline constexpr T max(T a, T b) {
return b < a ? a : b;
}
template <typename T, typename... Rest>
inline constexpr T max(T a, T b, Rest... c) {
return max(max(a, b), c...);
}
// msb(x)
// Return index of most significant one bit in `x`, plus one.
// Returns 0 if `x == 0`.
inline constexpr int msb(int x) {
return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
}
inline constexpr int msb(unsigned x) {
return x ? sizeof(x) * 8 - __builtin_clz(x) : 0;
}
inline constexpr int msb(long x) {
return x ? sizeof(x) * 8 - __builtin_clzl(x) : 0;
}
inline constexpr int msb(unsigned long x) {
return x ? sizeof(x) * 8 - __builtin_clzl(x) : 0;
}
inline constexpr int msb(long long x) {
return x ? sizeof(x) * 8 - __builtin_clzll(x) : 0;
}
inline constexpr int msb(unsigned long long x) {
return x ? sizeof(x) * 8 - __builtin_clzll(x) : 0;
}
// lsb(x)
// Return index of least significant one bit in `x`, plus one.
// Returns 0 if `x == 0`.
inline constexpr int lsb(int x) {
return __builtin_ffs(x);
}
inline constexpr int lsb(unsigned x) {
return __builtin_ffs(x);
}
inline constexpr int lsb(long x) {
return __builtin_ffsl(x);
}
inline constexpr int lsb(unsigned long x) {
return __builtin_ffsl(x);
}
inline constexpr int lsb(long long x) {
return __builtin_ffsll(x);
}
inline constexpr int lsb(unsigned long long x) {
return __builtin_ffsll(x);
}
// round_down(x, m)
// Return the largest multiple of `m` less than or equal to `x`.
// Equivalently, round `x` down to the nearest multiple of `m`.
template <typename T>
inline constexpr T round_down(T x, unsigned m) {
static_assert(std::is_unsigned<T>::value, "T must be unsigned");
return x - (x % m);
}
// round_up(x, m)
// Return the smallest multiple of `m` greater than or equal to `x`.
// Equivalently, round `x` up to the nearest multiple of `m`.
template <typename T>
inline constexpr T round_up(T x, unsigned m) {
static_assert(std::is_unsigned<T>::value, "T must be unsigned");
return round_down(x + m - 1, m);
}
// round_down_pow2(x)
// Return the largest power of 2 less than or equal to `x`.
// Equivalently, round `x` down to the nearest power of 2.
// Returns 0 if `x == 0`.
template <typename T>
inline constexpr T round_down_pow2(T x) {
static_assert(std::is_unsigned<T>::value, "T must be unsigned");
return x ? T(1) << (msb(x) - 1) : 0;
}
// round_up_pow2(x)
// Return the smallest power of 2 greater than or equal to `x`.
// Equivalently, round `x` up to the nearest power of 2.
// Returns 0 if `x == 0`.
template <typename T>
inline constexpr T round_up_pow2(T x) {
static_assert(std::is_unsigned<T>::value, "T must be unsigned");
return x ? T(1) << msb(x - 1) : 0;
}
// Character traits
inline bool isspace(int c) {
return (c >= '\t' && c <= '\r') || c == ' ';
}
inline bool isdigit(int c) {
return (unsigned(c) - unsigned('0')) < 10;
}
inline bool islower(int c) {
return (unsigned(c) - unsigned('a')) < 26;
}
inline bool isupper(int c) {
return (unsigned(c) - unsigned('A')) < 26;
}
inline bool isalpha(int c) {
return ((unsigned(c) | 0x20) - unsigned('a')) < 26;
}
inline bool isalnum(int c) {
return isalpha(c) || isdigit(c);
}
inline int tolower(int c) {
return isupper(c) ? c + 'a' - 'A' : c;
}
inline int toupper(int c) {
return islower(c) ? c + 'A' - 'a' : c;
}
// Checksums
uint32_t crc32c(uint32_t crc, const void* buf, size_t sz);
inline uint32_t crc32c(const void* buf, size_t sz) {
return crc32c(0, buf, sz);
}
// Bit arrays
struct bitset_view {
uint64_t* v_;
size_t n_;
struct bit {
uint64_t& v_;
uint64_t m_;
inline constexpr bit(uint64_t& v, uint64_t m);
NO_COPY_OR_ASSIGN(bit);
inline constexpr operator bool() const;
inline bit& operator=(bool x);
inline bit& operator|=(bool x);
inline bit& operator&=(bool x);
inline bit& operator^=(bool x);
};
// initialize a bitset_view for the `n` bits starting at `v`
inline bitset_view(uint64_t* v, size_t n)
: v_(v), n_(n) {
}
// return size of the view
inline constexpr size_t size() const;
// return bit `i`, which can be examined or assigned
inline bool operator[](size_t i) const;
inline bit operator[](size_t i);
// return minimum index of a 1-valued bit with index >= `i`, examining at
// most `n` bits
inline size_t find_lsb(size_t i = 0, size_t n = -1) const;
// return minimum index of a 0-valued bit with index >= `i`, examining at
// most `n` bits
inline size_t find_lsz(size_t i = 0, size_t n = -1) const;
};
// System call numbers (passed in `%rax` at `syscall` time)
// Used in pset 1:
#define SYSCALL_GETPID 1
#define SYSCALL_YIELD 2
#define SYSCALL_PAUSE 3
#define SYSCALL_CONSOLETYPE 4
#define SYSCALL_PANIC 5
#define SYSCALL_PAGE_ALLOC 6
#define SYSCALL_FORK 7
// Used in later psets:
#define SYSCALL_EXIT 8
#define SYSCALL_READ 9
#define SYSCALL_WRITE 10
#define SYSCALL_CLOSE 11
#define SYSCALL_DUP2 12
#define SYSCALL_PIPE 13
#define SYSCALL_EXECV 14
#define SYSCALL_OPEN 15
#define SYSCALL_UNLINK 16
#define SYSCALL_READDISKFILE 17
#define SYSCALL_SYNC 18
#define SYSCALL_LSEEK 19
#define SYSCALL_FTRUNCATE 20
#define SYSCALL_RENAME 21
#define SYSCALL_GETTID 22
#define SYSCALL_CLONE 23
#define SYSCALL_TEXIT 24
#define SYSCALL_KTEST 25
// Add new system calls here.
// Your numbers should be >=128 to avoid conflicts.
// System call error return values
#define E_AGAIN -11 // Try again
#define E_BADF -9 // Bad file number
#define E_CHILD -10 // No child processes
#define E_FAULT -14 // Bad address
#define E_FBIG -27 // File too large
#define E_INTR -4 // Interrupted system call
#define E_INVAL -22 // Invalid argument
#define E_IO -5 // I/O error
#define E_MFILE -24 // Too many open files
#define E_NAMETOOLONG -36 // File name too long
#define E_NFILE -23 // File table overflow
#define E_NOENT -2 // No such file or directory
#define E_NOEXEC -8 // Exec format error
#define E_NOMEM -12 // Out of memory
#define E_NOSPC -28 // No space left on device
#define E_NOSYS -38 // Invalid system call number
#define E_NXIO -6 // No such device or address
#define E_PERM -1 // Operation not permitted
#define E_PIPE -32 // Broken pipe
#define E_RANGE -34 // Out of range
#define E_SPIPE -29 // Illegal seek
#define E_SRCH -3 // No such process
#define E_TXTBSY -26 // Text file busy
#define E_2BIG -7 // Argument list too long
#define E_MINERROR -100
inline bool is_error(uintptr_t r) {
return r >= static_cast<uintptr_t>(E_MINERROR);
}
// System call constants
// sys_waitpid() options
#define W_NOHANG 1
// sys_open() flags
#define OF_READ 1
#define OF_WRITE 2
#define OF_CREATE 4
#define OF_CREAT OF_CREATE // ¯\_(ツ)_/¯
#define OF_TRUNC 8
// sys_lseek() origins
#define LSEEK_SET 0 // Seek from beginning of file
#define LSEEK_CUR 1 // Seek from current position
#define LSEEK_END 2 // Seek from end of file
#define LSEEK_SIZE 3 // Do not seek; return file size
// CGA console printing
#define CONSOLE_COLUMNS 80
#define CONSOLE_ROWS 25
#define CPOS(row, col) ((row) * 80 + (col))
#define CROW(cpos) ((cpos) / 80)
#define CCOL(cpos) ((cpos) % 80)
#define END_CPOS (CONSOLE_ROWS * CONSOLE_COLUMNS)
extern volatile uint16_t console[CONSOLE_ROWS * CONSOLE_COLUMNS];
// current position of the cursor (80 * ROW + COL)
extern volatile int cursorpos;
// types of console display
#define CONSOLE_NORMAL 0
#define CONSOLE_MEMVIEWER 1
extern volatile int consoletype;
// console_clear
// Erases the console and moves the cursor to the upper left (CPOS(0, 0)).
void console_clear();
#define COLOR_ERROR 0xC000
#define COLOR_SUCCESS 0x0A00
// console_puts(cursor, color, s, len)
// Write a string to the CGA console. Writes exactly `len` characters.
//
// The `cursor` argument is a cursor position, such as `CPOS(r, c)`
// for row number `r` and column number `c`. The `color` argument
// is the initial color used to print; 0x0700 is a good choice
// (grey on black).
//
// Returns the final position of the cursor.
int console_puts(int cpos, int color, const char* s, size_t len);
// console_printf(cursor, color, format, ...)
// Format and print a message to the CGA console.
//
// The `format` argument supports some of the C printf function's escapes:
// %d (to print an integer in decimal notation), %u (to print an unsigned
// integer in decimal notation), %x (to print an unsigned integer in
// hexadecimal notation), %c (to print a character), and %s (to print a
// string). It also takes field widths and precisions like '%10s'.
//
// The `cursor` argument is a cursor position, such as `CPOS(r, c)` for
// row number `r` and column number `c`.
//
// The `color` argument is the initial color used to print. 0x0700 is a
// good choice (grey on black). The `format` escape %C changes the color
// being printed; it takes an integer from the parameter list.
//
// Returns the final position of the cursor.
int console_printf(int cpos, int color, const char* format, ...);
// console_vprintf(cpos, color, format val)
// The vprintf version of console_printf.
int console_vprintf(int cpos, int color, const char* format, va_list val);
// Helper versions that default to printing white-on-black at the cursor.
void console_printf(int color, const char* format, ...);
void console_printf(const char* format, ...);
// Generic print library
struct printer {
virtual void putc(unsigned char c, int color) = 0;
void vprintf(int color, const char* format, va_list val);
};
// error_printf(cursor, color, format, ...)
// Like `console_printf`, but `color` defaults to `COLOR_ERROR`, and
// in the kernel, the message is also printed to the log.
__attribute__((noinline, cold))
int error_printf(int cpos, int color, const char* format, ...);
__attribute__((noinline, cold))
int error_vprintf(int cpos, int color, const char* format, va_list val);
__attribute__((noinline, cold))
void error_printf(int color, const char* format, ...);
__attribute__((noinline, cold))
void error_printf(const char* format, ...);
// Type information
// printfmt<T>
// `printfmt<T>::spec` defines a printf specifier for type T.
// E.g., `printfmt<int>::spec` is `"d"`.
template <typename T> struct printfmt {};
template <> struct printfmt<bool> { static constexpr char spec[] = "d"; };
template <> struct printfmt<char> { static constexpr char spec[] = "c"; };
template <> struct printfmt<signed char> { static constexpr char spec[] = "d"; };
template <> struct printfmt<unsigned char> { static constexpr char spec[] = "u"; };
template <> struct printfmt<short> { static constexpr char spec[] = "d"; };
template <> struct printfmt<unsigned short> { static constexpr char spec[] = "u"; };
template <> struct printfmt<int> { static constexpr char spec[] = "d"; };
template <> struct printfmt<unsigned> { static constexpr char spec[] = "u"; };
template <> struct printfmt<long> { static constexpr char spec[] = "ld"; };
template <> struct printfmt<unsigned long> { static constexpr char spec[] = "lu"; };
template <typename T> struct printfmt<T*> { static constexpr char spec[] = "p"; };
template <typename T> constexpr char printfmt<T*>::spec[];
// Assertions
// assert(x)
// If `x == 0`, print a message and fail.
#define assert(x, ...) do { \
if (!(x)) { \
assert_fail(__FILE__, __LINE__, #x, ## __VA_ARGS__); \
} \
} while (false)
__attribute__((noinline, noreturn, cold))
void assert_fail(const char* file, int line, const char* msg,
const char* description = nullptr);
// assert_[eq, ne, lt, le, gt, ge](x, y)
// Like `assert(x OP y)`, but also prints the values of `x` and `y` on
// failure.
#define assert_op(x, op, y) do { \
auto __x = (x); auto __y = (y); \
using __t = typename std::common_type<typeof(__x), typeof(__y)>::type; \
if (!(__x op __y)) { \
assert_op_fail<__t>(__FILE__, __LINE__, #x " " #op " " #y, \
__x, #op, __y); \
} } while (0)
#define assert_eq(x, y) assert_op(x, ==, y)
#define assert_ne(x, y) assert_op(x, !=, y)
#define assert_lt(x, y) assert_op(x, <, y)
#define assert_le(x, y) assert_op(x, <=, y)
#define assert_gt(x, y) assert_op(x, >, y)
#define assert_ge(x, y) assert_op(x, >=, y)
template <typename T>
__attribute__((noinline, noreturn, cold))
void assert_op_fail(const char* file, int line, const char* msg,
const T& x, const char* op, const T& y) {
char fmt[48];
snprintf(fmt, sizeof(fmt), "%%s:%%d: expected %%%s %s %%%s\n",
printfmt<T>::spec, op, printfmt<T>::spec);
error_printf(CPOS(22, 0), COLOR_ERROR, fmt, file, line, x, y);
assert_fail(file, line, msg);
}
// assert_memeq(x, y, sz)
// If `memcmp(x, y, sz) != 0`, print a message and fail.
#define assert_memeq(x, y, sz) do { \
auto __x = (x); auto __y = (y); size_t __sz = (sz); \
if (memcmp(__x, __y, __sz) != 0) { \
assert_memeq_fail(__FILE__, __LINE__, "memcmp(" #x ", " #y ", " #sz ") == 0", __x, __y, __sz); \
} \
} while (0)
__attribute__((noinline, noreturn, cold))
void assert_memeq_fail(const char* file, int line, const char* msg,
const char* x, const char* y, size_t sz);
// panic(format, ...)
// Print the message determined by `format` and fail.
__attribute__((noinline, noreturn, cold))
void panic(const char* format, ...);
#if CHICKADEE_KERNEL
struct regstate;
__attribute__((noinline, noreturn, cold))
void panic_at(const regstate& regs, const char* format, ...);
#endif
// bitset_view inline functions
inline constexpr bitset_view::bit::bit(uint64_t& v, uint64_t m)
: v_(v), m_(m) {
}
inline constexpr bitset_view::bit::operator bool() const {
return (v_ & m_) != 0;
}
inline auto bitset_view::bit::operator=(bool x) -> bit& {
if (x) {
v_ |= m_;
} else {
v_ &= ~m_;
}
return *this;
}
inline auto bitset_view::bit::operator|=(bool x) -> bit& {
if (x) {
v_ |= m_;
}
return *this;
}
inline auto bitset_view::bit::operator&=(bool x) -> bit& {
if (!x) {
v_ &= ~m_;
}
return *this;
}
inline auto bitset_view::bit::operator^=(bool x) -> bit& {
if (x) {
v_ ^= m_;
}
return *this;
}
inline constexpr size_t bitset_view::size() const {
return n_;
}
inline bool bitset_view::operator[](size_t i) const {
assert(i < n_);
return (v_[i / 64] & (1UL << (i % 64))) != 0;
}
inline auto bitset_view::operator[](size_t i) -> bit {
assert(i < n_);
return bit(v_[i / 64], 1UL << (i % 64));
}
inline size_t bitset_view::find_lsb(size_t i, size_t n) const {
unsigned off = i % 64;
uint64_t mask = ~(off ? (uint64_t(1) << off) - 1 : uint64_t(0));
n = min(n_ - i, n) + i;
i -= off;
unsigned b = 0;
while (i < n && !(b = lsb(v_[i / 64] & mask))) {
i += 64;
mask = -1;
}
return b ? min(n, i + b - 1) : n;
}
inline size_t bitset_view::find_lsz(size_t i, size_t n) const {
unsigned off = i % 64;
uint64_t mask = ~(off ? (uint64_t(1) << off) - 1 : uint64_t(0));
n = min(n_ - i, n) + i;
i -= off;
unsigned b = 0;
while (i < n && !(b = lsb(~v_[i / 64] & mask))) {
i += 64;
mask = -1;
}
return b ? min(n, i + b - 1) : n;
}
#endif /* !CHICKADEE_LIB_HH */